CAMPBELL BIOLOGY V.2(BHCC>CUSTOM<)
18th Edition
ISBN: 9781323655573
Author: Urry
Publisher: PEARSON C
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Textbook Question
Chapter 15, Problem 15.3CR
Why are specific alleles of two distant genes more likely to show recombination than those of two closer genes?
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Why does the presence of double crossovers allow for underestimation of recombinant frequency?
If a recombination frequency cannot be above 50%, what does it mean if two genes are, say, 60 mu apart? Does that mean they technically independently assort, there is just some sort of overestimation? Or that the two genes actually have another gene in between?
Why is it more efficient to perform a test cross with a homozygous recessive donor than a homozygous dominant donor? How could the same information still be found with a homozygous dominant donor?
Chapter 15 Solutions
CAMPBELL BIOLOGY V.2(BHCC>CUSTOM<)
Ch. 15.1 - Which one of Mendel's laws describes the...Ch. 15.1 - MAKE CONNECTIONS Review the description of...Ch. 15.1 - WHAT IF? Propose a possible reason that the first...Ch. 15.2 - A white-eyed female Drosophila is mated with a...Ch. 15.2 - Neither Tim nor Rhoda has Duchenne muscular...Ch. 15.2 - MAKE CONNECTIONS Consider what you learned about...Ch. 15.3 - When two genes are located on the same chromosome,...Ch. 15.3 - VISUAL SKILLS For each type of offspring of the...Ch. 15.3 - Prob. 3CCCh. 15.4 - Prob. 1CC
Ch. 15.4 - Prob. 2CCCh. 15.4 - Prob. 3CCCh. 15.5 - Gene dosagethe number of copies of a gene that are...Ch. 15.5 - Reciprocal crosses between two primrose varieties,...Ch. 15.5 - WHAT IF? Mitochondrial genes are critical to the...Ch. 15 - What characteristic of the sex chromosomes allowed...Ch. 15 - Why are males affected by X-Iinked disorders much...Ch. 15 - Why are specific alleles of two distant genes more...Ch. 15 - Prob. 15.4CRCh. 15 - Explain how genomic imprinting and inheritance of...Ch. 15 - A man with hemophilia (a recessive, sex-linked...Ch. 15 - Pseudohypertrophic muscular dystrophy is an...Ch. 15 - A wild-type fruit fly (heterozygous for gray body...Ch. 15 - A planet is inhabited by creatures that reproduce...Ch. 15 - Using the information from problem 4, scientists...Ch. 15 - A wild-type fruit fly (heterozygous for gray body...Ch. 15 - Assume that genes, A and B are on the same...Ch. 15 - Two genes of a flower, one Controlling blue (B)...Ch. 15 - You design Drosophila crosses to provide...Ch. 15 - Banana plants, which are triploid, are seedless...Ch. 15 - EVOLUTION CONNECTION Crossing over is thought to...Ch. 15 - SCIENTIFIC INQUIRY DRAW IT Assume you are mapping...Ch. 15 - WRITE ABOUT A THEME: INFORMATION The continuity of...Ch. 15 - SYNTHESIZE YOUR KNOWLEDGE Butter flies have an X-Y...
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- In the 1st image, are all gametes viable since they are parental crossovers? Also, in the 2nd image, are all gametes inviable since they are recombinant crossovers?arrow_forwardWhy is the frequency of recombinant gametes always half the frequency of crossing over?arrow_forwardWhy do strains #3 and #5 in the table below have different phenotypes?arrow_forward
- Below are the recombination frequencies between pairs of genes A, B, C and D. Based on this, what order do the genes have on a chromosome?arrow_forwardIn Figure 5-15, how are each of the following genotypesproduced?a. F+ a− c. F− a+b. F− a− d. F+ a+arrow_forwardThe following recombination frequencies are calculated for four linked genes in the image attached: What is the frequency of crossing-over between A and D? a. 8% b. 6% c. 15% d. 11%arrow_forward
- What phenomenon explains why the maximum percentage of recombinant offspring does not exceed 50%?arrow_forwardWhy do calculated recombination frequencies between pairs of loci that are located far apart underestimate the true genetic distances between loci?arrow_forwardIndividuals of genotype AaBb were mated to individuals of genotype aabb. One thousand offspring were counted, with the following results: 474 Aabb, 480 aaBb, 20 AaBb, and 26 aabb. What type of cross is it? Are these loci linked? What are the two parental classes and the two recombinant classes of offspring? What is the percentage of recombination between these two loci? How many map units apart are they?arrow_forward
- Hemophilia and color blindness are both recessive conditions caused by genes on the X chromosome. To calculate the recombination frequency between the two genes, you draw a large number of pedigrees that include grandfathers with both hemophilia and color blindness, their daughters (who presumably have one chromosome with two normal alleles and one chromosome with two mutant alleles), and the daughters sons. Analyzing all the pedigrees together shows that 25 grandsons have both color blindness and hemophilia, 24 have neither of the traits, 1 has color blindness only, and 1 has hemophilia only. How many centimorgans (map units) separate the hemophilia locus from the locus for color blindness?arrow_forwardIn a three-point testcross such as this one, why aren’t the F1 and the tester considered to be parental in calculating recombination? (They are parents in one sense.)arrow_forwardWhy is a 50 percent recovery of single-crossover products theupper limit, even when crossing over always occurs between twolinked genes ?arrow_forward
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